Am 10.07.2016 um 20:50 schrieb Le_Forgeron:

>>>> In fact, `.hf` is only available within functions; also, it is intended
>>>> to produce an "experimental feature" warning (but currently doesn't).
>>>>
>>>
>>> The code which set the flag is in comment in fncode.cpp ("// TODO
FIXME		Experimental_Flag |= EF_ISOFN;")
>>>
>>> Now, should it remains an experimental feature... I do not know.
>>
>> The code is bogus (the constant 0.996093 in the formula is not only a
>> "magic" value, but most certainly wrong), so it sure as hell shouldn't
>> become canonical in its current form.
>>
> 
> IIRC, the heigth field interpretation of the color (when coming from indexed
picture)
> was & is also bogus (kept as such for backward compatibility)

Yup. Not directly related though.

> (0.996093 looks like 255/256 : .99609375000000000000000000000000000000000000000000)

That's what I think, too.

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